Libby Dam History
Libby Dam in northwest Montana was constructed in response to annual spring flooding events cascading down from the Rocky Mountains that caused death and destruction to communities in the US and Canada located along the length of the Kootenai and Columbia River watersheds.
With Department of Defense contractors, the U.S. Army Corps of Engineers began construction in 1966 and the dam was dedicated Aug. 24, 1975.
Employing over 2,000 workers at the peak of construction, the Army Corps built three new schools, additions to existing schools and the Libby Airport. The Army Corps also moved the town of Rexford to higher ground, relocated Highway 37 and the Great Northern Railroad Line which includes a 7-mile long tunnel through Elk Mountain that trains still use today.
A forest development road was built on the west side of the reservoir, and the Koocanusa Bridge - Montana’s longest and highest bridge - was built to provide access across the reservoir.
There are many stories still being told by the families of the people who built the dam, and people whose lives were changed by the construction of this massive dam.
Click on the links below to learn more about the railroad tunnel USACE built during the construction of Libby Dam.
Railway Tunnel Libby Dam on JSTOR
Libby Dam 1975-2025
Soaring 422 feet tall, Libby Dam holds back the waters of the Kootenai River to form the 90-mile-long Lake Koocanusa reservoir, 42 miles of which are is in Canada. Libby Dam maintains a delicate, daily balancing act between providing protection from floods, producing hydroelectric power, and managing natural and cultural resources and recreation, while contributing to irrigation and navigation operations downstream.
Visit the Libby Dam Visitor Center between June, July, August and part of September, and learn more about Libby Dam’s history, current operations and future plans or visit Libby Dam’s public webpage: https://www.nws.usace.army.mil/Missions/Civil-Works/Locks-and-Dams/Libby-Dam/
Libby Dam Visitor Center is located approximately 17 miles north of Libby, MT.
Physical Address: 260 Souse Gulch Road, Libby, MT 59923.
Download maps beforehand, there is no cell phone reception once you leave Libby. Drive time from Libby is about 30 min.
Access to the Visitor Center is on the west side of the top of the dam by way of Montana Highway 37 and Forest Development Road 228. There is no automotive access across the top of the dam. Access from the east side of the dam is by way of Jennings Drive and the David Thompson Bridge immediately below the dam. Allow extra time for discovery and to enjoy the viewpoints and watchable wildlife areas around the dam.
Recreational opportunities at Libby Dam and on the nearby Kootenai National Forest include: camping, hunting, disc golf, hiking, fishing, boating, picnicking, touring the dam, wildlife watching and more.
For more information on summer hours of operation and summer tour schedule, please contact the Libby Dam Visitor Center at 406-293-5577.
50th Commemoration August 23, 2025
Look out for special summer 2025 events commemorating Libby Dam’s dedication of in 1975.